[ubuntu] Installing OS on USB question

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http://ubuntuforums.org – I apologize for asking such a silly question. I fully expected to see the answer in the install doc(s) or the FAQ. But if it's there I couldn't find it. Installed 12.10 on a USB and the trial experience went fine as I expected that it would. It is my desire to run the "real" Ubuntu OS (not just the trial iso) via a USB so that I can carry it around rather than installing it on a desktop. Sort of like Tails which is what I've been using. There doesn't seem to be a way to do that though. To be honest, I didn't actually try hitting the install button since I am on someone else (Hardware)